Low-Carbon Preparation of Ceramic Tiles from Building Ceramic Solid Waste by Simulating Hydrothermal Alternation

Abstract

Abstract: Ceramics are usually sintered over 1 000 ℃, which leads to 60% energy consumption of ceramic production process. Low temperature sintering is a key factor for energy saving and carbon reduction of ceramic industry.This article proposes a low-carbon method for preparing ceramics by simulating hydrothermal alteration reaction at 200 ℃ using ceramic solid waste as raw material. Waste ceramics were firstly pre-treated by ball milling to obtain submicron powder. Ceramic tiles were prepared from ceramic powder by hydrothermal alteration simulation. Under the optimal condition of 6 h ball milling of ceramic waste solid, 25% water content of submicron powder, K₂SiO₃ solution and 36 h reaction at 200 ℃, the flexural strength of the final product can reach (32.1±4) MPa fitting application requirement of ceramic tiles. X-ray diffraction, Fourier infrared spectroscopy and scanning electron microscopy were used to characterize the physical phase composition, functional group structure, and microscopic morphology of the samples before and after the reaction, and a possible reaction mechanism was given. It is confirmed that orthoclase and α-quartz crystals are produced during the hydrothermal etching reaction, and the growth of these two crystals effectively improves the flexural strength of ceramic tiles.

Key words: hydrothermal alternation, ceramic solid waste, orthoclase, α-quartz, ball milling, ceramic tiles

CLC Number:

TU522.09

WU Wenxin, ZHOU Zhengyuan, XIA Guanghua, NING Gaopeng, ZHOU Cailing. Low-Carbon Preparation of Ceramic Tiles from Building Ceramic Solid Waste by Simulating Hydrothermal Alternation[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2620-2629.

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